add a 1px border to a selection in a existing image

[Hosm10]

Hey everbody,

I'm working on this huge image, about 4608*3072 pixels, i want to add a tiny red(#FF0000) border(1px) to a selection, those are the steps i did:

But doesn't work, photoshop draw also other pixels with a shade of red, there seem no obvious to cause something like this...and it's not the case of my objective

I've been trying different tools to achieve that but haven't found a way yet. Does something like that exist? i need something like this

PS: the image size: 4608*3072, type : JPG

[Barb Binder · Accepted solution]

That's anti-aliasing—Photoshop is softening the transition from the red to the background. If you zoom back to 100%, it probably looks just fine.

That said, with the marching ants selection active as in the first screen shot:

• Window > Paths
• Click Make Work Path from Selection button
• Click to select the new Work Path
• Pick Stroke Path from the panel menu
• Change the Stroke Path tool to Pencil
• OK

[davescm]

You are seeing the impact of anti-aliasing - which is there to prevent jagged lines.

To get a 1px wide line round your selection that is not anti-aliased:

Either make your selection with the pen tool (or convert your existing selection to a path)

Then with the pencil tool selected and set at one pixel wide - stroke the path (click on the symbol at the bottom of the paths panel)

Dave

Edit to add : Answers round here are like buses. You wait a while then several come at once - well done Barbara for getting in quicker and with screenshots !

[JJMack]

It is also very easy to draw straight lines with a brush using the  Click and a shift click method...